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Math Question

I In the diagram of circle \( O \) below, chord \( \overline{C D} \) is parallel to diameter \( \overline{A O B} \) and \( \mathrm{m} \overparen{A C}=30 \). What is \( \mathrm{mCD} \) ? 1) 150 2) 120 3) 100 4) 60

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